Digital Electronics  Digital Arithmetic Operations and Circuits
Exercise :: Digital Arithmetic Operations and Circuits  General Questions
26. 
One way to make a fourbit adder perform subtraction is by: 
A. 
inverting the output.  B. 
inverting the carryin.  C. 
inverting the B inputs.  D. 
grounding the B inputs. 
Answer: Option C
Explanation:

27. 
What is the most important operation in binarycoded decimal (BCD) arithmetic? 
A. 
addition  B. 
subtraction  C. 
multiplication  D. 
division 
Answer: Option A
Explanation:

28. 
The range of positive numbers when using an eightbit two'scomplement system is: 
A. 
0 to 64  B. 
0 to 100  C. 
0 to 127  D. 
0 to 256 
Answer: Option C
Explanation:

29. 
What are the two types of basic adder circuits? 
A. 
sum and carry  B. 
halfadder and fulladder  C. 
asynchronous and synchronous  D. 
one and two'scomplement 
Answer: Option B
Explanation:

30. 
The truth table for a full adder is shown below. What are the values of X, Y, and Z?

A. 
X = 0, Y = 1, Z = 1  B. 
X = 1, Y = 1, Z = 1  C. 
X = 1, Y = 0, Z = 1  D. 
X = 0, Y = 0, Z = 1 
Answer: Option B
Explanation:
